Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 42,463	$ 28,963
Net cumulative translation adjustment and foreign currency exchange hedge, net of tax of $(527) and $2,012, respectively	(365)	(2,237)
Net unrealized gain on securities available-for-sale, net of tax of $14 and $115, respectively	23	187
Comprehensive Income	$ 42,121	$ 26,913